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One end of a brass bar is maintained at 298°C, while the other end is kept at a constant but lower temperature. The cross-sectional area of the bar is 3.00 10-4 m2. Because of insulation, there is negligible heat loss through the sides of the bar. Heat flows through the bar, however, at the rate of 2.5 J/s. What is the temperature of the bar at a point 0.24 m from the hot end?
A microwave oven operates at 2.4 GHz with an intensity inside the oven of 2650W/m2. What is the amplitude of the oscillating electric field
A vertical spring is 10.0 cm long when supporting a 20.0 kg mass, and it is 12.0 cm long when supporting a 32.0 kg mass. What is the length of spring with zero load
a monochromatic beam of x-rays with a wavelength of 0.280 nm is scattered by a metal foil. what is the observed scattering angle
q1. a chair of weight 125 n lies atop a horizontal floor the floor is not frictionless. you push on the chair with a
The drawing shows three different resistors in two different circuits. The battery has a voltage of V = 27 V, and the resistors have resistances of R1 = 50.0 ?, R2 = 25.0 ? and R3 = 10.0 ?. What is the total power supplied to the two resistors
A car rounds a 1.15 radius circular track at 82 Find the magnitude of the car's average acceleration after it has completed one-fourth of the circle.
Sketch a force diagram for the desk.
Using Newton's Version of Kepler's Third Law II Part A Pluto's moon Charon orbits Pluto every 6.4 days with a semimajor axis of 19,700 kilometers. Calculate the combined mass of Pluto and Charon. Express your answer using two significant figures. ..
A 3.0x10 ² kg piano is being lifted at a steady speed from ground level straight up to an apartment 10 m above the ground. How much time does it take to lift the piano
A pendulum of length 1.5 m is held out to point A. At the vertical position, an overhang effectively cuts the length of the pendulum by an amount equal to 1.09 m. (That is, 1.0 m is no longer free to swing.) How long does this pendulum take for one o..
a pair of parallel plates is charged by a 12-v battery. if the electric field between the plates is 1200 n/c, how far apart are the plates
What is the average force felt by a 0.06 kg tennis ball if it strikes the racket at a speed of 30m/s and leaves the racket with a speed of 50m/s in the opposite direction
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